I've brewed some pretty big beers in the last few months, & thought it may be of use to share the process & results with other 50L Braumeister users...
#1- Eisbock
OG 1.092
55L mash-in with 10kg grain.
mash schedule 10 min/38 deg, 60 min/ 68 deg
7L sparge at 68 deg
remove malt pipe, dump grain, refill with another 10kg grain, & mash at 68 deg for 60 min, mash out at 76 deg, 9L sparge.
120 min boil, end result of 48L of 1.092 wort.
#2 Imperial Stout
OG 1.097
53L mash-in with 10.3kg grain
mash-in 38 deg, 70 min at 68 deg
4L sparge at 68 deg
remove malt pipe, dump grain, refill with another 10.3kg grain, & mash at 68 deg for 70 min, mash out at 76 deg, 6.5L sparge.
boil length- pretty sure it was 90 min. (If not, then it was 120)
end result 42L of 1.097 wort
#3 Barley wine
OG 1.111
53L mash in with 10.3 kg grain
mash in 38 deg, 75 min at 65 deg, 4L sparge at 65 deg
remove malt pipe, dump grain, refill with another 10.3kg grain, & mash at 65 deg for 90 min, mash out at 76 deg, 4L sparge.
90 min boil
end result 40L wort at 1.101.
0.8kg dextrose & approx 0.6kg LDME added at end of boil gave final OG of 1.111
Pretty big numbers, with maybe about 80-90 mins added to the brew day length.
tips-
440g of pellet hops makes a REALLY big mess. Hops plugs/leaf for the final additions holds the whole mess together pretty well when draining.
Have some LDME on hand in case you don't reach your anticipated gravity
Have fun trying to get rid of ****-loads of spent grain!